80221979 has 2 divisors, whose sum is σ = 80221980. Its totient is φ = 80221978.

The previous prime is 80221969. The next prime is 80221991. The reversal of 80221979 is 97912208.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80221979 is a prime.

It is not a weakly prime, because it can be changed into another prime (80221909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40110989 + 40110990.

It is an arithmetic number, because the mean of its divisors is an integer number (40110990).

Almost surely, 2^80221979 is an apocalyptic number.

80221979 is a deficient number, since it is larger than the sum of its proper divisors (1).

80221979 is an equidigital number, since it uses as much as digits as its factorization.

80221979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 80221979 is about 8956.6723173286. The cubic root of 80221979 is about 431.2851026807.

It can be divided in two parts, 8022 and 1979, that added together give a palindrome (10001).

The spelling of 80221979 in words is "eighty million, two hundred twenty-one thousand, nine hundred seventy-nine".